Very smart use of the theme! Gameplay was engaging enough to keep me playing, but when I reached a certain point I realized the difficulty wasn't gonna go up any higher and my finger was getting tired :\ The way the doors move is really well done and it actually felt like I was holding a door back with the WASD keys! My biggest complaint is that the "click/hit" sound is the same every time, using 2 or 3 different sounds that slightly shift in pitch would work wonders! Good work.